Here's how it works:

* Plant Matter Accumulation: Large amounts of plant material, often in swampy environments, accumulate over time.

* Partial Decomposition: Anaerobic conditions (lack of oxygen) in these environments prevent the complete decomposition of the plant matter.

* Compression and Heat: Over millions of years, the layers of plant material are buried under sediment, leading to immense pressure and heat.

* Coal Formation: This pressure and heat transform the plant matter into coal, a solid fossil fuel rich in carbon.

While coal is the most direct result of plant breakdown, other sedimentary rocks can also be influenced by plant material:

* Peat: An early stage in coal formation, peat is partially decayed plant matter.

* Oil Shale: A rock containing kerogen, a waxy substance derived from organic matter, including plant material.

* Limestone: While not directly from plant matter, some limestone formation is influenced by marine organisms that utilize calcium from plant material.

It's important to note that the formation of sedimentary rocks involves a complex interplay of factors, and plant matter plays a crucial role in specific types of rocks, particularly coal.